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Analog Devices Inc./Maxim Integrated MAX4081TAUA+T
- Part No.:
- MAX4081TAUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Instrumentation, Op Amps, Buffer Amps
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX4081TAUA+T.pdf
- Description:
- IC CURRENT SENSE 1 CIRCUIT 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,750
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Product details
Overview
MAX4081TAUA+T from Maxim Integrated is a bidirectional, high-side current-sense amplifier with 20V/V gain, 4.5V–76V common-mode input range, ±125mV full-scale sense voltage, and operation over –40°C to +125°C. It delivers voltage output referenced to an external VREF (via REF1A/REF1B), enabling precise charge/discharge monitoring in battery-powered systems such as automotive 12V/24V power management and telecom backplane current sensing.
For engineers reviewing the MAX4081TAUA+T datasheet, MAX4081TAUA+T pinout, MAX4081TAUA+T application, or MAX4081TAUA+T equivalent, key selection criteria include its bidirectional sensing capability, 20V/V fixed gain, µMAX-8 package footprint, 150kHz bandwidth, and requirement for external reference biasing - all critical for accurate high-voltage, low-offset current measurement in safety-critical embedded power systems.
Technical Context
The MAX4081TAUA+T implements a precision current mirror-based architecture that maintains constant input terminal voltages across RS+ and RS− during bidirectional sensing, enabling accurate VSENSE = (VRS+ − VRS−) measurement independent of supply voltage. Its internal level-shifting stage references OUT to VREF (average of REF1A and REF1B), allowing polarity detection via (VOUT − VREF) sign and magnitude.
Unlike unidirectional variants, the MAX4081TAUA+T requires dual reference inputs (REF1A and REF1B) to establish zero-current output at VREF; it supports flexible referencing modes - either both pins tied to a common low-noise source, or REF1B grounded with REF1A supplying twice the desired VREF - ensuring robust operation under varying system grounding schemes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Gain | 20V/V - sets output scaling: ±125mV input yields ±2.5V swing around VREF, optimizing ADC dynamic range for mid-range current sensing. |
| Common-Mode Input Range | 4.5V to 76V - enables direct high-side sensing on 12V, 24V, 42V, and 48V rails without level-shifting or ground disturbance. |
| Input Offset Voltage | ±0.1 mV (typ) at +25°C - contributes ≤ ±0.5% error at full-scale ±125mV sense voltage, critical for battery SOC accuracy. |
| Supply Current | 103 µA (typ) - enables always-on current monitoring in low-power automotive modules without significant battery drain. |
| Bandwidth | 150 kHz - supports real-time response to fast load transients in motor control and DC-DC converter feedback loops. |
| CMRR / PSRR | 100 dB (min) - rejects noise from high-voltage bus coupling and supply ripple, essential in noisy industrial/automotive environments. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial power-system deployment. |
Pinout & Package
MAX4081TAUA+T is housed in an 8-pin µMAX® package (pin-compatible with SO-8 but 30% smaller footprint), optimized for space-constrained high-voltage PCB layouts. Thermal performance supports 362mW continuous dissipation at +70°C ambient.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 RS+ | High-side sense resistor connection (positive) | Connects to battery/system rail side of RSENSE; withstands up to +80V absolute max relative to GND. |
| 2 VCC | Supply voltage input | Independent 4.5V–76V supply; decoupling with ≥0.1µF ceramic capacitor required for transient immunity. |
| 3,6,7 N.C. | No internal connection | Leads may be left open or grounded; no electrical function - used for mechanical stability and thermal relief. |
| 4 GND | Analog ground reference | Return path for internal circuitry; must be connected to clean system ground plane to minimize offset drift. |
| 5 OUT | Voltage output | Single-ended output referenced to VREF; swings from VREF to VCC (charge) or VREF to GND (discharge). |
| 8 RS− | High-side sense resistor connection (negative) | Connects to load side of RSENSE; differential input pair with RS+ defines VSENSE = (RS+ − RS−). |
| - REF1A | Reference voltage input A | Primary reference pin; average of REF1A and REF1B defines VREF - set to stable low-noise source (1.5V–6V). |
| - REF1B | Reference voltage input B | Secondary reference pin; tied to REF1A (for VREF = VREF1A) or GND (for VREF = VREF1A/2); enables flexible biasing. |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional current sensing | Single OUT pin indicates polarity and magnitude of ISENSE via (VOUT − VREF), eliminating need for dual-output or external comparators in battery charge/discharge monitoring. |
| External reference flexibility | REF1A/REF1B allow VREF configuration as either VREF1A (both pins tied) or VREF1A/2 (REF1B grounded), supporting diverse system reference architectures without redesign. |
| High common-mode rejection | 100 dB CMRR ensures accurate sensing despite large common-mode noise on 48V telecom buses or automotive 12V/24V lines. |
| Low quiescent current | 103 µA supply current enables integration into always-on subsystems (e.g., battery fuel gauging) without compromising standby battery life. |
| Wide operating voltage | 4.5V–76V independent VCC and common-mode range allows use with legacy 12V systems and next-gen 48V architectures without auxiliary supplies. |
Applications
| Automotive Battery Management | 48V Telecom Backplane Monitoring |
|---|---|
|
Use Scenario: Real-time monitoring of Li-ion battery pack charge/discharge cycles in start-stop and mild-hybrid vehicles. IC Role / Device Role / Timing Role: High-side current sensor feeding analog input of microcontroller ADC; provides polarity-resolved current data at 10kHz update rate. Use Value: Enables accurate state-of-charge (SOC) estimation with <±0.5% full-scale error, extending battery service life and improving functional safety compliance. |
Use Scenario: Continuous current measurement on 48V DC distribution boards in telecom central offices and edge servers. IC Role / Device Role / Timing Role: High-side monitor placed upstream of hot-swap controllers and POL converters; outputs voltage proportional to load current for system telemetry. Use Value: Delivers ±125mV full-scale sensitivity with 150kHz bandwidth, capturing transient surges during board insertion while rejecting 50/60Hz supply noise via 100dB CMRR. |
| Bidirectional Motor Control Feedback | Precision High-Voltage Current Sources |
|
Use Scenario: Closed-loop current regulation in H-bridge-driven BLDC motors for industrial actuators and EV power steering. IC Role / Device Role / Timing Role: Bidirectional sense amplifier interfacing between motor phase leg and controller; provides real-time IPHASE feedback for PWM duty-cycle adjustment. Use Value: 20V/V gain and ±125mV input range match typical shunt voltages, minimizing ADC gain stages while maintaining 16-bit effective resolution over 100:1 dynamic range. |
Use Scenario: Stable current sourcing for avalanche photodiodes (APDs) and PIN diodes in optical transceivers and medical imaging systems. IC Role / Device Role / Timing Role: Precision current regulator element; senses feedback current through series shunt and drives op-amp DAC to maintain setpoint. Use Value: 100µV input offset and 0.1% gain accuracy ensure sub-0.1% current regulation stability over temperature, critical for low-light signal integrity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bidirectional high-side current sensing applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| INA240A1QDGKRQ1 | 500kHz bandwidth, integrated 20V/V gain, no external reference required; higher quiescent current (1.8mA). | Preferred for high-speed motor control where bandwidth >150kHz is mandatory; less suitable for ultra-low-power always-on monitoring. | Select INA240A1QDGKRQ1 when system-level speed requirements exceed 150kHz and external reference routing is undesirable. |
| MAX40016ATA+T | 200kHz bandwidth, 20V/V gain, integrated reference buffer, lower offset (±25µV), RoHS-compliant µMAX-8 package. | Targeted at newer designs requiring tighter offset specs and simplified reference design; not qualified for automotive temp range. | Select MAX40016ATA+T for non-automotive industrial applications demanding <±0.1% full-scale error and reduced layout complexity. |
Compared with INA240A1QDGKRQ1 and MAX40016ATA+T, the MAX4081TAUA+T offers superior automotive temperature qualification (–40°C to +125°C), lower supply current (103µA vs. 1.8mA), and proven field reliability in telecom infrastructure - making it optimal for cost-sensitive, thermally demanding, and long-lifecycle deployments where moderate bandwidth suffices.
Availability
MAX4081TAUA+T is available at Aetrix Electronics and suitable for automotive battery management, 48V telecom backplane monitoring, and bidirectional motor control applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX4081TAUA+T includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated, now part of Analog Devices, designs precision analog and mixed-signal ICs for power, sensing, and connectivity in harsh-environment applications.
The MAX4080/MAX4081 product line was engineered specifically for high-voltage, high-accuracy current sensing in automotive, telecom, and industrial systems where ground-path integrity and wide common-mode range are non-negotiable.
FAQ
What is the full-scale input range for MAX4081TAUA+T?
The MAX4081TAUA+T has a full-scale sense voltage range of ±125mV, corresponding to bidirectional current flow through the external sense resistor. At 20V/V gain, this produces a ±2.5V output swing around the externally applied VREF level. This range is specified across the full –40°C to +125°C operating temperature range and is validated per Maxim's DC Electrical Characteristics table.
Does MAX4081TAUA+T require an external reference voltage?
Yes, the MAX4081TAUA+T requires external biasing via REF1A and REF1B pins to establish its zero-current output level (VOUT = VREF). VREF is defined as the average of REF1A and REF1B; these pins can be tied together to a stable low-noise source (e.g., 2.5V), or REF1B grounded with REF1A set to 5.0V to yield VREF = 2.5V - both configurations are supported per the External References section of the datasheet.
What package type does MAX4081TAUA+T use?
The MAX4081TAUA+T uses the 8-pin µMAX® package (package code U8+1), a compact surface-mount outline measuring 3mm × 3mm with 0.65mm lead pitch. It is RoHS-compliant (denoted by the '+' suffix), thermally rated for 362mW at +70°C, and pin-compatible with industry-standard SO-8 footprints when adapter layout is used.
How does MAX4081TAUA+T differ from MAX4080TAUA+T?
The MAX4081TAUA+T is bidirectional and requires external reference inputs (REF1A/REF1B) to define zero-current output, whereas the MAX4080TAUA+T is unidirectional with single-ended output referenced to GND. Both share identical 20V/V gain, 4.5V–76V common-mode range, and µMAX-8 packaging, but only the MAX4081TAUA+T supports polarity detection and charge/discharge separation in battery applications.
What is the maximum supply voltage for MAX4081TAUA+T?
The MAX4081TAUA+T supports a supply voltage (VCC) range of 4.5V to 76V, with absolute maximum rating of +80V. This independent supply rating allows operation even when VCC is derived from a separate low-voltage rail while monitoring a much higher common-mode voltage on RS+/RS− - a key enabler for isolated high-side sensing in multi-rail systems.
MAX4081TAUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Amplifier Type:
- Current Sense
- Number of Circuits:
- 1
- Output Type:
- -
- Slew Rate:
- -
- Gain Bandwidth Product:
- -
- -3db Bandwidth:
- 150 kHz
- Current - Input Bias:
- 5 µA
- Voltage - Input Offset:
- 100 µV
- Current - Supply:
- 103µA
- Current - Output / Channel:
- -
- Voltage - Supply Span (Min):
- 4.5 V
- Voltage - Supply Span (Max):
- 76 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-uMAX/uSOP
MAX4081TAUA+T FAQ
1.How can I place an order for MAX4081TAUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX4081TAUA+T on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MAX4081TAUA+T reliable?
The price and inventory of MAX4081TAUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX4081TAUA+T is usually 5 days.
3.What payment methods are accepted for MAX4081TAUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX4081TAUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX4081TAUA+T?
MAX4081TAUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX4081TAUA+T order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MAX4081TAUA+T?
For technical support, including MAX4081TAUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX4081TAUA+T requirements.
6.How does Aetrix verify that MAX4081TAUA+T is sourced from the original manufacturer or authorized distributors?
All MAX4081TAUA+T products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MAX4081TAUA+T meets industry standards.
7.What is the process for return or replacement of MAX4081TAUA+T?
All MAX4081TAUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX4081TAUA+T, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MAX4081TAUA+T part is unused and in its original packaging.
Return procedure for MAX4081TAUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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